Drilling tool



J1me 1930- J. H. HOLLESTELLE 1,766,253

DRILLING TOOL Original Filed Sept. 8, 1922 2 Sheets-Sheet 1 (27/.Amman/6;

WlTNESS:

ATTORNEY 5mm 24 W30. J. H. HQLLESTELLE 3 DRILLING TOOL Original FiledSept. 8, 1922 2 Sheets-Sheet 2 J'H fiallesielle.

INVENTOR WXTNESS: ATTORNEY Patented June 24, 1930 UNITED STATES JANHENDRIX HOLLESTELLE, or s'r. LOUIS, MISSOURI, assienonro rnEfxnNnEnYEconroaarron or wnmmoron, nnnnwnnu, a coaroan'rronor DELAWARE" DRILLING'roor."

Application filed September a, 1922. sci-mine. 586,932.aeneweazany-12,,gisza' jf 1 f This invention relates to well drillingtools and has for an object the provision of a tool of this characterwhich includes both a center bit and a lateral extension bit, whereby adrilling and reaming operation is provided and which is capable of useeither as a rotary or an impact drilling tool.

Another object of the invention is the provision of a normally retractedlateral extenm sion bit having means whereby the latter will beautomatically extended when the tool reaches its lowered or drillingposition.

Another object of the invention is the prolowered, together withmeansfor automatically releasing the lowering means to permit operation ofthe lateral bit extending means.

With the above and other objects in View,

. the invention further includes the following novel features anddetails of construction, to

be hereinafter more fully described, illustrated in the accompanyingdrawings and pointed out in the appended claims.

In the drawings Figure l is a side elevation of a drilling toolconstructed in accordance with the invention with the drill. shoe andcasing shown a in section and a lateral extension bit ex- 3 tended,

Figure 2 is a central vertical sectional view of the same with the:lateral extension bit retracted and the parts in the position as- 5sumed before the tool reaches its lowered position. i

Figure 3 is a view similar to Figure 2 with the lateral bit extended andlocked in extended position.

Figure 4 is a section on the line 4-4 of Figure 1.

Figure dis a section on theline 5-5 of Figure 2.

. "Figure 6 is a 5 Figure 3. I

Figure 7 is a detail s'ectional view of the lower end of the bitcarrying member, the section being taken at right angles to Figures 2and 3.

Figure 8 is an edge View of the lateral bit.

section on the line of vision of means whereby the tool may be:

Figure 9'is a detail elevation of'the guide for the extension bit. i pFigure 10 is a detail sectional viewiof' the drill shoe. i I Figure 11is a detail elevation of the low-j ering'tool. Referring in detail tothe drawings, the invention is shown. as-including a drill shoe 15,which is interiorly threaded at its upper end for connection with thelowermost section 16of a casing of any standard type.) The shoe 15 isprovided with oppositely located sockets 1'7 and with spiral grooves 18and '19., both of which are in communication with a longitudinallydisposed groove 20. 5

Located within theshoe l5 and movable longitudinally therein is a bitcarrying inember 21, whose lower end is providedwith a threaded socket22 for the'reception of various types of bits, coring devices and soforth. 7 Secured within this socket 22 is the shank 23 of a center bit24,- the said shank being provided with longitudinally disposed passages25 which communicate with a. passage 26 provided in the bit carryingmember '21, whereby water may be fed to the center bit. The upper end ofthe bit carrying member 21 is provided with springfingers 27' havinglugs 28 at their free ends and these lugs: are adapted to engage in the,sockets .17ofl the drill shoe'for the purpose of holding the member '21"against longitudinal movement with res ct to said shoe.

cated within the bit carrying member 21 are spaced guides 29 havinggrooves 30 therein adja /fcent the inner periphe'ry'of the member 21 vsoas to provide passages for the water to tl 'ecenter bit. In addition,the bit carrying member 21 is provided with downwardly and outwardlyextending passages 31, which also serve as water passages; The guides 29have their lower ends arranged upon opposite sides of a spacing rib 32whichf" is carried by the bit carrying member 21' and positioned betweenthe guides 29 and resting 95 upon thisrib 32 is'an extension bit 33, thelatter being provided at its'lower outer corner with a cutting element34. An edge plate 33" is securedto the bit 33 by means of screws 33".When the bit 33 is projected in the position shown in Figures 3 and 4 ofthe drawings, this cutting element 34 will act as a reamer to enlargethe bore made by the centerbit 24. The bit carrying member 21 and theshoe 15 are provided with longitudinally disposed slots and 36respectively so as to permit of the extension of the bit 33. Extendingfrom opposite side faces of the bit 33 are upper and lower pins or studs36', which.

are movable in vertically disposed curved grooves 37 provided in each ofthe guide members 29, while the bit carrying member 21 is provided witha stud 38 carried by a spring 38" and which operates in the grooves 18,19 and 20. This permits of the bit carrying member being moved withrespect to the dIlll shoe and when so moved the said member willcarrywith it the guide members 29 and the grooves 37 will cause the bit33 to be extended throu h the slots 35 and 36. When in this extendedposition, a stud 39 which is carried by the bit 33 engages a socket 40provided in the shoe 15 so as to prevent any tendency to upwardmovement. 1

The carrier bolt 41' extends transversely across the bit carrying member21 above the bit 33, while the guide members 29 are connected'at theirupper ends by a head 42. Ex-

tending from this head 42 is a shank 43, Whose upper end carries abeveled or cone-shaped head 44 having a shoulder 45 at its juncture withthe shank 33. This head is adapted to be received within the jaws 46 ofa lowering tool 47. The opposed faces of these jaws are upwardly andinwardly inclined as shown at 48, while their lower ends carry inwardlyextending lugs 49 which are adapted to engage the shoulders 45 so as togrip the head 44. A

wedge pin 50 extends between thej aws 46 and acts to force these jawsapart to release the .lowerin tool fromthe head 44, as will behereinafter apparent. q

The tool is lowered within the shoe 15 until the stud 38 enters eitherof the grooves 18 or 19 and is permitted further downward move:

ment, the particular groove entered causing the tool .to rotate so as tobring the'lugs 28,

. directly above or l-.line with the sockets 17.

When thetool is in this position, the bit 34 is in line with the'slots35 and 36, the upper end of said bit being above the upper end of theslot, and the stud 38' at the upper end of the. slot 20. This osition ofthe shown in Figure 2 o the'drawings. downward movement of thetool willbring the lugs 28 into position to enter the sockets 17, the, tool beingguided by the downward travel of the lug 38 in the ve'r tical' slot 20.During this further downward movement of the tool, the bit 34 will havereached a position opposite the slots 35 and 36, and as the lugs 28 haveentered the sockets 17 the head 42 is released from its position uponthese lugs and is permitted downward movement 5 so-that the spacedguides 29 will move down- :ister, a bifurcated member and movableindependently'of thebit carrying member, and interengaging means beartsis urther ward independently of the member 21. During this downwardmovement engagement of the studs 36 with the walls of the grooves 37will force the bit 34 outward through the slots 35 and 36, so that theparts will then be arranged as shown in Figure 3 of the drawings. Bypermitting the lowering tool 47 to move downward, the wedge 50 willengage the lugs 28 or the head 44, so that' the wedgewill be forcedinward between the jaws to move said gaws relatively outward and releasethe tool. his position of the parts is illustrated in Figure 1 of thedrawings.

The invention is susceptible of various changes in its form, proportionsand minor details of construction and the right is herein reserved tomake such changes as properly fall within the scope of the appendedclaims.

Having described the invention what is claimed is I 1. In a drillingtool, a casing carried shoe having a slot therein, a bit carrying membermovably positioned within the shoe and also having a slot therein, anormally retracted lateral extension bit Within the bit carrying member,interengaging means between the shoe and bit carrying member to bringthe slots into register when the said bit carrying member is movedwithin the shoe, means to lock the bit carrying member and shoe againstrelative movement when the slots are'in register, and means 0 erablewhen the bit carrying member and sihoe are locked together to force thebit laterally through the slots.

2. In a drilling tool, a casing carried shoe having a slot therein, abit carrying member movably positioned within the shoe and also having aslot therein, a normally retracted lateral extension bit within the bitcarrying member, interengaging means between the shoe and bit carryingmember to bring the slots into register when the said bit carryingmember is' moved within theshoe, means to lock the bit carrying memberand shoe against relative movement when the slots are in reglocatedwithin tween the bifurcated member and bit to move said bit-laterallythrough the slots when the bifurcated member is independently moved. Intestimony whereof I afiix my signature. JAN HEN DRIK HOLLESTELLE.

